Not a bug Error After Deleting A Member Via Admincp

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Server Error
Undefined offset: 12891
1. XenForo_Application::handlePhpError() in LastPosts/Model/PostList.php at line 43
2. LastPosts_Model_PostList::getPostsArray() in LastPosts/Controller/Public.php at line 19
3. LastPosts_Controller_Public->actionIndex() in Dark/TaigaChat/ControllerPublic/Index.php at line 8
4. Dark_TaigaChat_ControllerPublic_Index->actionIndex() in Yilmaz/MoviesPosters/Controller/Public.php at line 6
5. Yilmaz_MoviesPosters_Controller_Public->actionIndex() in XenTrCom/TopPoster/Controller/Public.php at line 6
6. XenTrCom_TopPoster_Controller_Public->actionIndex() in XenForo/FrontController.php at line 303
7. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 132
8. XenForo_FrontController->run() in /home/path/public_html/index.php at line 15